Mechanical aid for isometric drawing



29, 1967 J. R MCGUIRE ETAL 3,337,962

1 MECHANICAL AID FOR ISOMETRIC DRAWING Filed May 31, 1966 IN V EN TORS J. Rees Mc Gil/Ft? Robert D. McGuire United States Patent 3,337,962 MECHANICAL AID FOR ISOMETRIC DRAWING J. Rees McGuire, Riverside, Ontario, Canada (833 Buckingham Drive, Windsor, Ontario, Canada), and Robert D. McGuire, Riverside, Ontario, Canada (825 Fairview Blvd, Windsor, Ontario, Canada) Filed May 31, 1966, Ser. No. 553,889 3 Claims. (CI. 33-77) This invention relates to drafting aids, and more particularly a mechanical aid for isometric drawing.

It is therefore the main purpose of this invention to provide a mechanical aid for isometric drawing adapted to considerably reduce time required for drawing conventional isometric lines.

Another object of this invention is to provide a mechanical aid for isometric drawing which increases the accuracy of the lines as opposed to the conventional methods known in the prior art.

Another object of this invention is to provide a mechanical aid for isometric drawingwhich is adapted to significantly contribute in solving various drafting problems where isometric representation is required.

Still another object of this invention is to provide a mechanical aid for isometric drawing which is inexpensive to manufacture, easy to use, is of rigid construction, and is designed to provide maximum utility to the draftsman.

Other objects and advantages of this invention will become apparent from a consideration of the following detailed description taken in connection with the accompanying drawing, wherein a satisfactory embodiment of the invention is shown. However, it is to be understood that the invention is not limited to the details disclosed but includes all such variations and modifications as fall within the spirit of the invention and the scope of the appended claims.

In the drawing:

FIGURE 1 is a perspective view of this invention.

FIGURE 2 is a perspective view of a slide unit and its retainer removed from the invention.

FIGURE 3 is a perspective View of another slide unit and its retainer removed from the invention.

According to this invention, a mechanical aid for isometric drawings is provided with a base plate 11 of generally rectangular configuration. A primary side retainer 12 having a pair of upwardly directed flaps is capable of slidably supporting an elongated, rectangular slide 15 which is provided with a pair of opaque lines 18 and 19, said lines are positioned in perpendicular relationship from the sides of the elongated slide 15 and are spaced from each other in parallel. Another primary slide retainer 13 is provided with a pair of upwardly directed flaps adapted to slidably support another elongated, rectangular slide 16 which is also provided with opaque lines 20 and 21. Thus the primary slide retainers 12 and 13 are permanently fixed to base 11 at an angle of 60 degrees to each other. The slides 15 and 16, however, are capable of longitudinal movements in the retainers 12 and 13 in such a manner that their respective opaque lines 18, 20, 19 and 21 at all times assume perpendicular relationship in the direction of travel. A secondary retainer 14 is capable of slidably supporting-a generally rectangular secondary transparent slide 17 which is provided with an opaque line 22, said line is positioned 60 from the side of the generally rectangular slide 17. Thus the secondary slide retainer 14 is permanently fixed to the base 11 and is adapted to bisect the angle formed by the positions of the slide retainers 12 and 13.

Looking now at the drawing, one will see that at least three orthographic views 23, 24, and 25 are required. Orthographic view 23 is adapted to show the length of an object and is taped onto the slide retainer 12 under the transparent slide 15. Orthographic view 24 showing the breadth of the object is taped onto the slide retainer 13 under the transparent slide 16. Orthographic view 25 showing the thickness of the object is taped onto the slide retainer 14 under the transparent slide 17. A translucent work paper 26 is taped or otherwise secured on the face portion of the transparent slide 17. Thus, as it can be seen from the previous description, the opaque line 18 is positioned over a given point A on the orthographic view 23. Opaque line 20 is positioned over the corresponding point A on orthographic view 24, and the opaque line 22 is positioned over the corresponding point A on the orthographic view 25. This causes the translucent work paper 26 to be marked with a point at the intersection of the opaque lines 19 and 21 which indicate the isometric directions to be drawn on said paper 26. This operation may be repeated as many times as it is necessary.

What we now claim is:

1. A mechanical aid for isometric drawing, comprising, in combination, a base plate, a pair of primary base retainers, a moveable, rectangular, primary transparent slide within each of said primary retainers, said retainers being secured on said base at 60 degrees to each other, said slides being slidable in directions 60 degrees to each other, each said primary slide being provided with a first and second opaque line in parallel, spaced relation from each other, and positioned degrees to said sliding direction of said slide, a secondary retainer secured to said base, a secondary transparent, rectangular, slide adapted to move within said secondary retainer, a singular opaque line positioned on said slide of said secondary retainer, said singular opaque line being positioned at an angle of 60 degrees respective to a sliding direction of said secondary slide, said secondary slide moving in a direction that bisects said 60-degree angle between said primary slides, all three said slides being of a length to overlap each other with said secondary slide being uppermost, means for securing an orthographic view on each said slide retainer for alignment below said first of said opaque lines of each said primary slide and said opaque line of said secondary slide, and a translucent work paper secured on said secondary slide for alignment with the said second of said opaque line on said primary slides for establishing a reference point for an isometric drawing on said translucent work paper.

2. A combination as set forth in claim 1 wherein each of said primary base retainers and said secondary base retainer is provided with a pair of upwardly extending flanges which provide sliding means for said primary slides, and said secondary slide, and each of said flanges being spaced in parallel relationship from each other on each said retainer.

3. The aid for isometric drawing according to claim 1, wherein each transparent slide assumes an elongated and substantially rectangular configuration and each slide is po sitioned in such a manner as to not interfere with the longitudinal travel path of another slide.

No references cited.

LEONARD FORMAN, Primary Examiner.

HARRY N. HAROIAN, Assistant Examiner. 

1. A MECHANICAL AID FOR ISOMETRIC DRAWING, COMPRISING, IN COMBINATION, A BASE PLATE, A PAIR OF PRIMARY BASE RETAINERS, A MOVEABLE, RECTANGULAR, PRIMARY BASE RESLIDE WITHIN EACH OF SAID PRIMARY RETAINERS, SAID RETAINERS BEING SECURED ON SAID BASE AT 60 DEGREES TO EACH OTHER, SAID SLIDES BEING SLIDABLE IN DIRECTIONS 60 DEGREES TO EACH OTHER, EACH SAID PRIMARY SLIDE BEING PROVIDED WITH A FIRST AND SECOND OPAQUE LINE IN PARALLEL, SPACED RELATION FROM EACH OTHER, AND POSITIONED 90 DEGREES TO SAID SLIDING DIRECTION OF SAID SLIDE, A SECONDARY RETAINER SECURED TO SAID BASE, A SECONDARY TRANSPARENT, RECTANGULAR, SLIDE ADAPTED TO MOVE WITHIN SAID SECONDARY RETAINER, A SINGULAR OPAQUE LINE POSITIONED ON SAID SLIDE OF SAID SECONDARY RETAINER, SAID SINGULAR OPAQUE LINE BEING POSITIONED AT AN ANGLE OF 60 DEGREES RESPECTIVE TO A SLIDING DIRECTION OF SAID SECONDARY SLIDE, SAID SECONDARY SLIDE MOVING IN A DIRECTION THAT BISECTS SAID 60-DEGREE ANGLE BETWEEN SAID PRIMARY SLIDES, ALL THREE SAID SLIDES BEING OF A LENGTH TO OVERLAP 